The article contains the results of vibro-acoustic signal processing using Hilbert-Huang transform, obtained during the test of the internal combustion engine. The providence of experiments and methods of vibro-acoustic signal processing is described.

Keywords: Hilbert-Huang transform, Hilbert spectrum, empirical mode decomposition, the decomposition of the ensemble, the Fourier spectrum, wavelet transform, diagnostics, non-destructive testing, the internal combustion engine, vibro-acoustic signal.

This article is devoted to the issues related to energy saving in extraction of petroleum with high viscosity and bitumen. The author identifies the shortcomings of existing methods of thermal insulation of steam lines. The article contains the calculation of the specific heat loss of steam pipelines with polyurethane insulation. The calculation is considering an influence of the thermal destruction on the coefficient of transcalency of insulation.

Keywords: steam pipe, heat losses, polyurethane insulation, mineral wool, thermal destruction, petroleum-producing

Reliability of existing structure of thermal networks and search of an optimum zone of connection of new consumers taking into account the received indicator is investigated.

Keywords: Reliability, thermal networks, diagnostics, heat supply system, reliability indicator